Echo Measurement Utility

To provide a comprehensive assessment of voice quality irrespective of network type, GL has various tools combined together into one integrated platform consisting of VQuad™, Dual UTA HD, T1 E1, and WebViewer™. This platform provides the ability to make VoIP, TDM, and Mobile calls from any fixed or mobile location. All interface flexibility is provided (2-Wire, 4-Wire, VoIP, TDM, and Mobile) within the Dual UTA and USB T1 E1 Analyzer. In addition, VQuad™ provides algorithms for signaling, voice transmission, and voice quality assessment. WebViewer™ provides the central point where voice metrics are stored and displayed through a WEB interface.

GL’s Echo Measurement Utility (EMU) software within this architecture provides a means to assess sidetone, line, and acoustic echo and corresponding delays. EMU is an offline adjunct analysis application (under control of VQuad™, or as stand-alone) that compares the source and received files to determine echoes and delay of echoes.

Basic Concept-Hybrid-Acoustic-Echo.

Echo Measurement Utility (EMU) ERL Vs Delay Analysis

As shown above, the EMU requires only two files to function - the sending file and simultaneously recorded received file. Any tool that achieves this can be used with the EMU.

EMU provides delay and ERL measurements for all detected echoes, along with an ‘ERL vs Delay’ plot where each echo is depicted within the plot. One can zoom-in on a particular echo to gauge overall echo impairments. In addition, the application includes signal graphs for source signal, received signal, error signal, and adaptive filter coefficients.

Call Scenarios - Line (Hybrid) Echo Analysis

Following are few of the important real-time scenarios where Line (Hybrid) Echo and Acoustic Echo analysis can be done using EMU, when used with VQuad™ and/or MAPS™ Emulator. These tools allow to send and receive voice files for Echo measurement across various network types.

VQuad™ with Dual UTA HD

The EMU can be used effectively with different hardware/software to support nearly any network interface. The figure below depicts EMU working with VQuad™/ Dual UTA intrusive tool. VQuad™ software along with the Dual UTA hardware supports transmitting and receiving files across the following interfaces: RJ11 2-wire analog, 3.5 mm jack for mobile headset connection, Handset phones and balanced I/O for VoIP soft phones.

In addition, VQuad™ provides the capability to remotely control the EMU through scripting, thus, automating the entire testing process including sending results to the central database for access via GL’s WebViewer™.

EMU with GL’s Intrusive VQuad™ Tool

MAPS™ SIP or VQuad™ with VoIP option

T1/E1 Analysers or VQuad™ with T1/E1 Option

GL’s T1/E1 Analysis application (requires hardware) is used with EMU to detect possible echoes through a T1/E1 channel. Through MAPS™ scripting or VQuad™ with T1/E1 option, it is possible to automate the entire testing process including sending and receiving files. The intrusive files and the received files are fed as input to EMU for further analysis.

EMU with GL’s Intrusive T1/E1 Analysis Application

Results

The Operator information option is used to print the result in spread sheet. The generated “Result” spread sheet includes operator information, file information, echo characteristics, and snapshots of all the signal graphs.

Result Sheet

Intrusive-Received-Signals-Graph

Please review the above and give us a call if you are interested in the above product/software or for any other applications listed in our website. We would be happy to discuss your testing needs and we look forward to hearing from you.